Abstract
Oxidation reactions of ilmenite (FeTiO 3) have been investigated during thermal annealing and ball milling processes using X-ray diffraction and thermal analyses. Thermal oxidation reactions consist of a low-temperature (<1000°C) reaction with the formation of intermediate phases (Fe 2Ti 3O 9 and Fe 2O 3) and high-temperature (>1000°C) reactions with the formation of final thermally stable phases (Fe 2TiO 5 and TiO 2). Only the low-temperature reaction occurred during ball milling at room temperature and the high-temperature reactions were not observed, even after a prolonged milling. It is also found that the thermally stable Fe 2TiO 5 phase transforms to the metastable Fe 2Ti 3O 9 phase during milling in oxygen. The different behaviours of the oxidation of ilmenite between thermal annealing and mechanical milling are due to different structural stabilities of oxides and different reaction mechanisms.
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